busybox/coreutils/sleep.c

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/* vi: set sw=4 ts=4: */
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/*
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* sleep implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Rewritten to do proper arg and error checking.
* Also, added a 'fancy' configuration to accept multiple args with
* time suffixes for seconds, minutes, hours, and days.
*/
#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
#if ENABLE_FEATURE_FANCY_SLEEP
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static const struct suffix_mult sfx[] = {
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{ "s", 1 },
{ "m", 60 },
{ "h", 60*60 },
{ "d", 24*60*60 },
{ }
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};
#endif
int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sleep_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
unsigned duration;
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++argv;
if (!*argv)
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bb_show_usage();
#if ENABLE_FEATURE_FANCY_SLEEP
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duration = 0;
do {
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duration += xatoul_range_sfx(*argv, 0, UINT_MAX-duration, sfx);
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} while (*++argv);
#else /* FEATURE_FANCY_SLEEP */
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duration = xatou(*argv);
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#endif /* FEATURE_FANCY_SLEEP */
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if (sleep(duration)) {
bb_perror_nomsg_and_die();
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}
return EXIT_SUCCESS;
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}